Tool for upsetting and calking stay-bolts.



G B WOOD & E G MEIER TOOL FOR UPSBTTING AND OALKING STAY BOLTS.

APPLIOA'TION FILED APEHI, 1909. I

Patented Au .30,1910.

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C. MEIER, OF PHOENIXVILLE, PENNSYLVANIA, AS- BOILER COMPANY, OF ST. LOUIS, MISSOURI, A COR- TOOL FOR UPSETTING AND CALKING STAY-BOLTS.

Specification of Letters Patent. Application filed April 7, 1909.

Patented Aug. so, 191a. Serial NO. 438,536.

To all whom it may concern:

Be it known that we, GEORGE E. Woon and EDWARD C. MEIER, both citizens of the United States, residing at Phoenixville, Chester county, Pennsylvania, have invented a certain new and useful Improvement in Tools for Upsetting and Calking Stay-Bolts, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to tools for upsetting and calking hollow stay-bolts.

Prior to our invention-the method practiced in upsetting and calking hollow staybolts was as follows :-A tapered drit't pin was first driven into the end of the hollow bolt, and the end of the bolt was then upset or mashed down by means of a hammer held in the hand of the operator. Thereafter, the operator took a hammer and chisel ora sharp-pointed tool and calked the head of the bolt or forced its peripheral edge into intimate engagement with the plate through which the bolt extended so as to make a tight joint. This method of upsetting and calking hollow stay-bolts is slow and therefore expensive because it requires three separate steps or operations. First, driving the drift pin into the bolt; second, mashing down or upsetting the end of the bolt with a hand-operated hammer; and third, call:- ing the head of the bolt with a. hand-chisel and hammer. Such a method also very an imperfect piece of work for the head of the bolt was not smooth and uniform, the head was very often out too deeply into the plate, and the bolt very often closed up slightly during the upsetting operation so that it was necessary to ream out the bolt.

The main object of our invention is to provide a tool that will rivet or upset a hollow stay-bolt quickly and also call: it in one operation.

Another object is to provide a stay-bolt upsetting and calking tool that can be connected to a power-operated hammer and which will form a smooth and perfect head on the bolt having its peripheral edge portion sunk or cut into the plate evenly.

Figure 1 of the drawing is a vertical sectional view showing our improved tool in operative position on a hollow stay-bolt preparatory to the upsetting and calking operation; Fig. 2 is a vertical sectional view of the bolt, during the first stage of the upsetting operation, namely, after the end of the bolt has been mashed down; Fig. 2 is a vertical sectional view of the bolt after the upsetting and calking completed; Fig. 3 is an end view of the tool that upsets and calks the bolt; and Fig. 4 is a top plan view of the anvil or support upon which one end of the bolt rests during the operation of upsetting and calking the opposite end of the bolt.

Referring to the drawing which illustrates the preferred form of our invention. 1 designates a hollow stay-bolt that is screwed into a. pair of plates 2 spaced away from each other. and A designates a tool that is used for upsetting and (talking the ends of the bolt 1. This tool comprises a shank 3 having a hexagonal-shaped extension 4,- which is adapted to be connected to a power-operated hammer 5, shown in dotted lines in Fig. 1, such, for example, as a pneumatic, electric or a hydraulic hammer. The shank 3 of said tool is provided with a head 6 having a tapered center pin 7that projects into the end of the bolt 1, as shown in Fig. 1, so to prevent said bolt from closing up during the operation of upsetting the end of the bolt'to form a head thereon. The head of the tool is also provided with av plurality of lugs or portions 8 having substantially concaved' faces 9 that terminate in calking edges 10, as shown clearly in F ig. 1.

While we have herein shown the tool as being provided with three lugs 8 we wish it to be understood that it is immaterial, so far as our broad idea is concerned, how many of such lugs the head 6 of the tool is provided with for our broad idea consists in a tool that has a central pin which is adapted to project into the end of the hollow bolt, a substantially concaved surface for upsetting the end of the bolt to form a solid head thereon, and a calking edge for sinking the peripheral. edge of the bolt-head into the plate or member through which the boltprojects. During the operation of upsetting and calking the bolt, the lower end of the bolt rests upon or is supported by an anvil B having a tapered central pin 11 that projects into the lower end of the bolt and a concaved surface 12 that merges into said central pin 11.

operation has been To upset and calk a hollow stay-bolt with a tool of the construction above described the bolt. is placed upon the anvil B, as shown in Fin". l. the central pin 11 of said anvil projecting into the lower end of the bolt. The tool A, which has been previously connected K to some suitable kind of poweroperated l hammer, is then placed upon the upper end of the bolt so that the central pin 7 on the head of said tool projects into the upper end of the bolt. The power which actuates the hammer is then turned on, and the blows which the hammer imparts to the shank of I said tool A cause the sulistantially concaved surfaces 9 on the head of said tool. to upsetor mash down the upper end of the bolt, as l shown in Fig. 2, the hammer to which the 1 tool is connected being revolved during the upsetting operation so that the concaved surfaces 9 will. travel around the end of the bolt and thus gradually mash down the metal and force it laterally over the plate through which the bolt. projects. During the last stage of the upsetting operation the pmi er-operated hammer is rocked slightly so as to cause the concaved surfaces 9 on the lugs S to round off the upset portion of the bolt and thus form a solid rounded head and after the head has been formed the hanuner 5 is canted slightly so l edges 10 on the hi the peripheral edge of the bolt-head into the plate 2, as shown in Fig. 2 and thus calk said head or form a tight joint between same as to cause the calking as 8 of the tool to sink and the plate 2.

Owing to the fact that the anvil B is provided with an approximately concavedl surface iithe lower end of the bolt will be 1 flanged or upset slightly at 1%, as shown in l Figs. 2 and 2, during the operation of up- 1 setting and milking; the upper end of the\ bolt. After the upper end of the bolt has been upset and ealked, the plates 2 through which the bolt projects, are inverted so that l the upset end of the bolt will rest upon the anvil or supporting member while the opl posite end of the bolt is being upset and l calked. 1 'eferably, an anvil having a concaved SlillflCB that conforms accurately to the head of the bolt is used for supporting the upset end of the bolt while the opposite end of the bolt is being upset and calked but as said anvil is of the same construction as the anvil B shown in Fig. 1, we have not illustrated it, the only ditterence being in the curvature of the top face of the anvil.

The main advantage of a tool of this construction is that it upsets and calks a staybolt in practically a single operation, thus greatly reducing the time and also the cost of driving hollow stay-bolts. Furthermore, a tool of this construction produces a more finished piece of work for the end of the bolt is subjected to uniform pressure so that a perfectly smooth head will be produced. The head is also calked more perfectly than a bolt calked by a hand-chisel and hammer for the peripheral edge of the bolt-head is sunk uniformly into the plate with which it contacts.

While we have herein shown our improved tool used for upsetting and calking a hollow stay-bolt that is screwed into the plates, it willr of course, be obvious that it could be used for upsetting and calkin g a tube that is merely slipped through openings in the plates and therefore the term hollow staybolt used in the claims should be construed as covering tubes or unthreaded devices Having thus described our invention, What we claim as new and desire to secure by Letters Patent is:

1. A. tool for upsetting and calking hollow stay-bolts, comprising a shank that is adapted to be connected to a power-operated hammer, a head on said shank provided with means for upsetting or mashing down the end of the bolt so as to form a solid head thereon, a guide on said tool head that projects into the end of the bolt so as to cause the metal in the bolt to be forced laterally during the upsetting operation, and means on said tool head for sinking the peripheral edge of the head on the bolt into the plate or member through which the bolt passes.

2. A tool for upsetting and calkin g hollow stay-bolts, comprising a shank that is adapted to be connected to a power-operated hammer. a head on said shank provided with a tapered guide that is adapted to project into the end of the bolt, lugs on said head provided with curved surfaces that cause the end of the bolt to be upset or mashed down so as to form a solid head on the bolt, and sharp edges on said lugs that sink the peripheral edge of the bolt-head into the plate or member through which the bolt passes.

In testimony our signatures, nesses. this 2nd whereof, we hereunto afiiX in the presence of two witday of April, 1909.

GEORGE E. \VOOD. EDXV. G. METER.

Witnesses: 1

Hanna D. RANKIN, KENNETH CALDER. 

